Mercor
Software Engineer, Agents
$160K–$500K
San Francisco · On-site · Full-time · Posted Sep 18, 2025
About the job
Build and scale agentic products, including LLM agents, RL environments, orchestration services, evaluation tools, and full-stack interfaces.
What you'll do
- Own agent features from scoping through implementation, launch, and iteration using customer feedback.
- Build agents, harnesses, verifiers, RL environments, orchestration pipelines, and tools for analyzing agent performance.
- Improve agent quality through evaluations, trace instrumentation, failure analysis, and collaboration with Product, Design, Research, and Operations.
Pay
$160K – $500K (USD, base salary)
Tools
Python, FastAPI, Temporal, Modal, Next.js, React, LangGraph, LangChain
AI focus
Build and improve LLM agents and frontier-agent RL environments; develop evaluations, verifiers, orchestration, and reliability improvements.
Model-written summary · the original posting is authoritative